package org.apache.maven.repository.legacy.resolver.transform;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;

import org.apache.maven.artifact.Artifact;
import org.apache.maven.artifact.deployer.ArtifactDeploymentException;
import org.apache.maven.artifact.repository.ArtifactRepository;
import org.apache.maven.artifact.repository.RepositoryRequest;
import org.apache.maven.artifact.repository.metadata.Metadata;
import org.apache.maven.artifact.repository.metadata.RepositoryMetadata;
import org.apache.maven.artifact.repository.metadata.RepositoryMetadataResolutionException;
import org.apache.maven.artifact.repository.metadata.Snapshot;
import org.apache.maven.artifact.repository.metadata.SnapshotArtifactRepositoryMetadata;
import org.apache.maven.artifact.repository.metadata.Versioning;
import org.apache.maven.artifact.resolver.ArtifactResolutionException;
import org.codehaus.plexus.component.annotations.Component;
import org.codehaus.plexus.util.StringUtils;

/**
 * @author <a href="mailto:brett@apache.org">Brett Porter</a>
 * @author <a href="mailto:mmaczka@interia.pl">Michal Maczka</a>
 */
@Component(role = ArtifactTransformation.class,
    hint = "snapshot")
public class SnapshotTransformation extends AbstractVersionTransformation {
  private String deploymentTimestamp;

  private static final TimeZone UTC_TIME_ZONE = TimeZone.getTimeZone("UTC");

  private static final String UTC_TIMESTAMP_PATTERN = "yyyyMMdd.HHmmss";

  public void transformForResolve(Artifact artifact, RepositoryRequest request) throws ArtifactResolutionException {
    // Only select snapshots that are unresolved (eg 1.0-SNAPSHOT, not 1.0-20050607.123456)
    if (artifact.isSnapshot() && artifact.getBaseVersion().equals(artifact.getVersion())) {
      try {
        String version = resolveVersion(artifact, request);
        artifact.updateVersion(version, request.getLocalRepository());
      } catch (RepositoryMetadataResolutionException e) {
        throw new ArtifactResolutionException(e.getMessage(), artifact, e);
      }
    }
  }

  public void transformForInstall(Artifact artifact, ArtifactRepository localRepository) {
    if (artifact.isSnapshot()) {
      Snapshot snapshot = new Snapshot();
      snapshot.setLocalCopy(true);
      RepositoryMetadata metadata = new SnapshotArtifactRepositoryMetadata(artifact, snapshot);

      artifact.addMetadata(metadata);
    }
  }

  public void transformForDeployment(Artifact artifact, ArtifactRepository remoteRepository,
      ArtifactRepository localRepository) throws ArtifactDeploymentException {
    if (artifact.isSnapshot()) {
      Snapshot snapshot = new Snapshot();

      snapshot.setTimestamp(getDeploymentTimestamp());

      // we update the build number anyway so that it doesn't get lost. It requires the timestamp to
      // take effect
      try {
        int buildNumber = resolveLatestSnapshotBuildNumber(artifact, localRepository, remoteRepository);

        snapshot.setBuildNumber(buildNumber + 1);
      } catch (RepositoryMetadataResolutionException e) {
        throw new ArtifactDeploymentException("Error retrieving previous build number for artifact '"
            + artifact.getDependencyConflictId() + "': " + e.getMessage(), e);
      }

      RepositoryMetadata metadata = new SnapshotArtifactRepositoryMetadata(artifact, snapshot);

      artifact.setResolvedVersion(constructVersion(metadata.getMetadata().getVersioning(), artifact.getBaseVersion()));

      artifact.addMetadata(metadata);
    }
  }

  public String getDeploymentTimestamp() {
    if (deploymentTimestamp == null) {
      deploymentTimestamp = getUtcDateFormatter().format(new Date());
    }
    return deploymentTimestamp;
  }

  protected String constructVersion(Versioning versioning, String baseVersion) {
    String version = null;
    Snapshot snapshot = versioning.getSnapshot();
    if (snapshot != null) {
      if (snapshot.getTimestamp() != null && snapshot.getBuildNumber() > 0) {
        String newVersion = snapshot.getTimestamp() + "-" + snapshot.getBuildNumber();
        version = StringUtils.replace(baseVersion, Artifact.SNAPSHOT_VERSION, newVersion);
      } else {
        version = baseVersion;
      }
    }
    return version;
  }

  private int resolveLatestSnapshotBuildNumber(Artifact artifact, ArtifactRepository localRepository,
      ArtifactRepository remoteRepository) throws RepositoryMetadataResolutionException {
    RepositoryMetadata metadata = new SnapshotArtifactRepositoryMetadata(artifact);

    getLogger().info("Retrieving previous build number from " + remoteRepository.getId());
    repositoryMetadataManager.resolveAlways(metadata, localRepository, remoteRepository);

    int buildNumber = 0;
    Metadata repoMetadata = metadata.getMetadata();
    if ((repoMetadata != null)
        && (repoMetadata.getVersioning() != null && repoMetadata.getVersioning().getSnapshot() != null)) {
      buildNumber = repoMetadata.getVersioning().getSnapshot().getBuildNumber();
    }
    return buildNumber;
  }

  public static DateFormat getUtcDateFormatter() {
    DateFormat utcDateFormatter = new SimpleDateFormat(UTC_TIMESTAMP_PATTERN);
    utcDateFormatter.setTimeZone(UTC_TIME_ZONE);
    return utcDateFormatter;
  }

}
